A severely infected form of chlamydia inside a woman's vagina in which her vaginal canal appears to be sharp with raised lacerations containing a greenish hue. This condition is attributed to its similarity to the actual kryptonite cave in the comic book Superman. Contact with the said condition by penis will cause gangrene or "hulk penis." If your girl has the kryptonite cave, you are in some serious business.
I was going down on this girl at a party, but I got gangrene on my lips from her kryptonite cave.
When I was having sex with a whore, my dick soon had deep cuts on it from her deeply distorted kryptonite cave.